DESCRIPTION OF PLATES. 
079 
PLATE IX. 
No. 1. Section across Wayne county. 
— 2. Section across Ontario county. 
— 3. Section across Ontario and Yates counties. 
— 4. Section across Steuben county. 
The two figures above at the right hand are of alluvial hills. By uniting the sections 1, 3 and 4, we 
have a continuous section across all the formations from Lake Ontario to the Pennsylvania line. 
The outline of this and the sections of the three following plates are at a uniform elevation above 
Lake Ontario, and the numbers given indicate the height above that lake, in feet. The base of the 
sections is sometimes continued only as low as the level of Lake Erie, or even of Crooked lake. 
These variations are all indicated in the engraving. 
PLATE X. 
No. 1. Section across Wayne county. 
— 2. Section across Seneca county. 
— 3. Section across Tompkins county. 
— 4. Section across Chemung county. 
By uniting these four sections, a continuous one across the district is presented. 
Section of the inclined plane at Ithaca. The letters a, b, c, d, &c. indicate the numerous alternations of 
hard and soft shale and shaly sandstone, with a few courses of compact calcareous sandstone. 
PLATE XI. 
No. 1. Section across Monroe county. 
— 2. Section across Livingston county. 
— 3. Section across Allegany county. 
These three sections united present a continuous one across the district, along the Genesee river. This 
section shows the succession of strata from the Medina sandstone to the Old Red sandstone and 
Conglomerate. 
No. 4. Section across Orleans county. 
5. Section across Genesee county. 
— 6. Section across Cattaraugus county. 
These three sections present another continuous line of section across the district. The relative eleva¬ 
tions of the surface are continued throughout. 
PLATE XII. 
No. 1. Section across Niagara county. 
— 2. Section across Erie county. 
— 3. Section across Chautauque county. 
The three sections united constitute a continuous section across the western counties of the district. 
The two outline sections, extending from Cayuga lake to the Genesee river and from thence to Lake 
Erie, are constructed from actual surveys, and present the elevations of the principal hills and 
valleys. The elevations here given are from the tables accompanying a topographical sketch of 
New-York (Transactions of the Albany Institute, Vol. I.). 
87*' 
